cleanup some `pre` css inheritance

We had various overrides of the bootstrap defaults for font-size and line-height every time we made a pre tag,
and then some overrides of our overrides when we wanted something slightly different.

This moves the most basic overrides to apply to all pre tags,
reducing the number of downstream changes we need.

IPython/html/static/base/less/variables.less

@@ -9,5 +9,12 b' code {'
   color: @black; // default code color in bootstrap is #d14 (crimson / amaranth)
 }
 
+pre {
+  // bootstrap has pre defaults that we don't want to inherit.
+  // start pre tag defaults based on the surrounding context instead.
+  font-size: inherit;
+  line-height: inherit;
+}
+
 // Our own global variables for all pages go here
 

IPython/html/static/notebook/less/cell.less

@@ -51,6 +51,7 b' div.input_area {'
     border: 1px solid @light_border_color;
     .corner-all;
     background: @cell_background;
+    line-height: @code_line_height;
 }
 
 /* This is needed so that empty prompt areas can collapse to zero height when there

IPython/html/static/notebook/less/codecell.less

@@ -37,10 +37,8 b' div.input_area > div.highlight {'
 
 div.input_area > div.highlight > pre {
     margin: 0px;
-    border: 0px;
+    border: none;
     padding: 0px;
     background-color: transparent;
-    font-size: @notebook_font_size;
-    line-height: @code_line_height;
 }
 

IPython/html/static/notebook/less/outputarea.less

@@ -83,12 +83,10 b' div.output_area pre {'
     margin: 0;
     padding: 0;
     border: 0;
-    font-size: 100%;
     vertical-align: baseline;
     color: black;
     background-color: transparent;
     .border-radius(0);
-    line-height: inherit;
 }
 
 /* This class is for the output subarea inside the output_area and after

IPython/html/static/notebook/less/pager.less

@@ -14,7 +14,6 b' div#pager {'
     display: none;
 
     pre {
-      font-size: @baseFontSize;
       line-height: @code_line_height;
       color: @textColor;
       background-color: @cell_background;

IPython/html/static/style/ipython.min.css

@@ -3,6 +3,7 b''
 .hide-text{font:0/0 a;color:transparent;text-shadow:none;background-color:transparent;border:0}
 .input-block-level{display:block;width:100%;min-height:30px;-webkit-box-sizing:border-box;-moz-box-sizing:border-box;box-sizing:border-box}
 code{color:#000}
+pre{font-size:inherit;line-height:inherit}
 .border-box-sizing{box-sizing:border-box;-moz-box-sizing:border-box;-webkit-box-sizing:border-box}
 .corner-all{border-radius:4px}
 .hbox{display:-webkit-box;-webkit-box-orient:horizontal;-webkit-box-align:stretch;display:-moz-box;-moz-box-orient:horizontal;-moz-box-align:stretch;display:box;box-orient:horizontal;box-align:stretch;display:flex;flex-direction:row;align-items:stretch}
@@ -74,12 +75,12 b' div.cell.edit_mode{border-radius:4px;border:thin #008000 solid}'
 div.cell{width:100%;padding:5px 5px 5px 0;margin:0;outline:none}
 div.prompt{min-width:11ex;padding:.4em;margin:0;font-family:monospace;text-align:right;line-height:1.21429em}
 @media (max-width:480px){div.prompt{text-align:left}}div.inner_cell{display:-webkit-box;-webkit-box-orient:vertical;-webkit-box-align:stretch;display:-moz-box;-moz-box-orient:vertical;-moz-box-align:stretch;display:box;box-orient:vertical;box-align:stretch;display:flex;flex-direction:column;align-items:stretch;-webkit-box-flex:1;-moz-box-flex:1;box-flex:1;flex:1}
-div.input_area{border:1px solid #cfcfcf;border-radius:4px;background:#f7f7f7}
+div.input_area{border:1px solid #cfcfcf;border-radius:4px;background:#f7f7f7;line-height:1.21429em}
 div.prompt:empty{padding-top:0;padding-bottom:0}
 div.input{page-break-inside:avoid;display:-webkit-box;-webkit-box-orient:horizontal;-webkit-box-align:stretch;display:-moz-box;-moz-box-orient:horizontal;-moz-box-align:stretch;display:box;box-orient:horizontal;box-align:stretch;display:flex;flex-direction:row;align-items:stretch}
 @media (max-width:480px){div.input{display:-webkit-box;-webkit-box-orient:vertical;-webkit-box-align:stretch;display:-moz-box;-moz-box-orient:vertical;-moz-box-align:stretch;display:box;box-orient:vertical;box-align:stretch;display:flex;flex-direction:column;align-items:stretch}}div.input_prompt{color:#000080;border-top:1px solid transparent}
 div.input_area>div.highlight{margin:.4em;border:none;padding:0;background-color:transparent}
-div.input_area>div.highlight>pre{margin:0;border:0;padding:0;background-color:transparent;font-size:14px;line-height:1.21429em}
+div.input_area>div.highlight>pre{margin:0;border:none;padding:0;background-color:transparent}
 .CodeMirror{line-height:1.21429em;height:auto;background:none;}
 .CodeMirror-scroll{overflow-y:hidden;overflow-x:auto}
 @-moz-document url-prefix(){.CodeMirror-scroll{overflow-x:hidden}}.CodeMirror-lines{padding:.4em}
@@ -117,7 +118,7 b' div.output_area{padding:0;page-break-inside:avoid;display:-webkit-box;-webkit-bo'
 div.output_area .rendered_html table{margin-left:0;margin-right:0}
 div.output_area .rendered_html img{margin-left:0;margin-right:0}
 .output{display:-webkit-box;-webkit-box-orient:vertical;-webkit-box-align:stretch;display:-moz-box;-moz-box-orient:vertical;-moz-box-align:stretch;display:box;box-orient:vertical;box-align:stretch;display:flex;flex-direction:column;align-items:stretch}
-@media (max-width:480px){div.output_area{display:-webkit-box;-webkit-box-orient:vertical;-webkit-box-align:stretch;display:-moz-box;-moz-box-orient:vertical;-moz-box-align:stretch;display:box;box-orient:vertical;box-align:stretch;display:flex;flex-direction:column;align-items:stretch}}div.output_area pre{margin:0;padding:0;border:0;font-size:100%;vertical-align:baseline;color:#000;background-color:transparent;-webkit-border-radius:0;-moz-border-radius:0;border-radius:0;line-height:inherit}
+@media (max-width:480px){div.output_area{display:-webkit-box;-webkit-box-orient:vertical;-webkit-box-align:stretch;display:-moz-box;-moz-box-orient:vertical;-moz-box-align:stretch;display:box;box-orient:vertical;box-align:stretch;display:flex;flex-direction:column;align-items:stretch}}div.output_area pre{margin:0;padding:0;border:0;vertical-align:baseline;color:#000;background-color:transparent;-webkit-border-radius:0;-moz-border-radius:0;border-radius:0}
 div.output_subarea{padding:.4em .4em 0 .4em;-webkit-box-flex:1;-moz-box-flex:1;box-flex:1;flex:1}
 div.output_text{text-align:left;color:#000;line-height:1.21429em}
 div.output_stderr{background:#fdd;}

IPython/html/static/style/style.min.css

@@ -1266,6 +1266,7 b' a .icon-rotate-90:before,a .icon-rotate-180:before,a .icon-rotate-270:before,a .'
 .icon-weibo:before{content:"\f18a"}
 .icon-renren:before{content:"\f18b"}
 code{color:#000}
+pre{font-size:inherit;line-height:inherit}
 .border-box-sizing{box-sizing:border-box;-moz-box-sizing:border-box;-webkit-box-sizing:border-box}
 .corner-all{border-radius:4px}
 .hbox{display:-webkit-box;-webkit-box-orient:horizontal;-webkit-box-align:stretch;display:-moz-box;-moz-box-orient:horizontal;-moz-box-align:stretch;display:box;box-orient:horizontal;box-align:stretch;display:flex;flex-direction:row;align-items:stretch}
@@ -1351,12 +1352,12 b' div.cell.edit_mode{border-radius:4px;border:thin #008000 solid}'
 div.cell{width:100%;padding:5px 5px 5px 0;margin:0;outline:none}
 div.prompt{min-width:11ex;padding:.4em;margin:0;font-family:monospace;text-align:right;line-height:1.21429em}
 @media (max-width:480px){div.prompt{text-align:left}}div.inner_cell{display:-webkit-box;-webkit-box-orient:vertical;-webkit-box-align:stretch;display:-moz-box;-moz-box-orient:vertical;-moz-box-align:stretch;display:box;box-orient:vertical;box-align:stretch;display:flex;flex-direction:column;align-items:stretch;-webkit-box-flex:1;-moz-box-flex:1;box-flex:1;flex:1}
-div.input_area{border:1px solid #cfcfcf;border-radius:4px;background:#f7f7f7}
+div.input_area{border:1px solid #cfcfcf;border-radius:4px;background:#f7f7f7;line-height:1.21429em}
 div.prompt:empty{padding-top:0;padding-bottom:0}
 div.input{page-break-inside:avoid;display:-webkit-box;-webkit-box-orient:horizontal;-webkit-box-align:stretch;display:-moz-box;-moz-box-orient:horizontal;-moz-box-align:stretch;display:box;box-orient:horizontal;box-align:stretch;display:flex;flex-direction:row;align-items:stretch}
 @media (max-width:480px){div.input{display:-webkit-box;-webkit-box-orient:vertical;-webkit-box-align:stretch;display:-moz-box;-moz-box-orient:vertical;-moz-box-align:stretch;display:box;box-orient:vertical;box-align:stretch;display:flex;flex-direction:column;align-items:stretch}}div.input_prompt{color:#000080;border-top:1px solid transparent}
 div.input_area>div.highlight{margin:.4em;border:none;padding:0;background-color:transparent}
-div.input_area>div.highlight>pre{margin:0;border:0;padding:0;background-color:transparent;font-size:14px;line-height:1.21429em}
+div.input_area>div.highlight>pre{margin:0;border:none;padding:0;background-color:transparent}
 .CodeMirror{line-height:1.21429em;height:auto;background:none;}
 .CodeMirror-scroll{overflow-y:hidden;overflow-x:auto}
 @-moz-document url-prefix(){.CodeMirror-scroll{overflow-x:hidden}}.CodeMirror-lines{padding:.4em}
@@ -1394,7 +1395,7 b' div.output_area{padding:0;page-break-inside:avoid;display:-webkit-box;-webkit-bo'
 div.output_area .rendered_html table{margin-left:0;margin-right:0}
 div.output_area .rendered_html img{margin-left:0;margin-right:0}
 .output{display:-webkit-box;-webkit-box-orient:vertical;-webkit-box-align:stretch;display:-moz-box;-moz-box-orient:vertical;-moz-box-align:stretch;display:box;box-orient:vertical;box-align:stretch;display:flex;flex-direction:column;align-items:stretch}
-@media (max-width:480px){div.output_area{display:-webkit-box;-webkit-box-orient:vertical;-webkit-box-align:stretch;display:-moz-box;-moz-box-orient:vertical;-moz-box-align:stretch;display:box;box-orient:vertical;box-align:stretch;display:flex;flex-direction:column;align-items:stretch}}div.output_area pre{margin:0;padding:0;border:0;font-size:100%;vertical-align:baseline;color:#000;background-color:transparent;-webkit-border-radius:0;-moz-border-radius:0;border-radius:0;line-height:inherit}
+@media (max-width:480px){div.output_area{display:-webkit-box;-webkit-box-orient:vertical;-webkit-box-align:stretch;display:-moz-box;-moz-box-orient:vertical;-moz-box-align:stretch;display:box;box-orient:vertical;box-align:stretch;display:flex;flex-direction:column;align-items:stretch}}div.output_area pre{margin:0;padding:0;border:0;vertical-align:baseline;color:#000;background-color:transparent;border-radius:0;-webkit-border-radius:0;-moz-border-radius:0;border-radius:0}
 div.output_subarea{padding:.4em .4em 0 .4em;-webkit-box-flex:1;-moz-box-flex:1;box-flex:1;flex:1}
 div.output_text{text-align:left;color:#000;line-height:1.21429em}
 div.output_stderr{background:#fdd;}
@@ -1515,7 +1516,7 b' ul#help_menu li a{overflow:hidden;padding-right:2.2em}ul#help_menu li a i{margin'
 .notification_widget{color:#777;padding:1px 12px;margin:2px 4px;z-index:10;border:1px solid #ccc;border-radius:4px;background:rgba(240,240,240,0.5)}.notification_widget.span{padding-right:2px}
 div#pager_splitter{height:8px}
 #pager-container{position:relative;padding:15px 0}
-div#pager{font-size:14px;line-height:20px;overflow:auto;display:none}div#pager pre{font-size:13px;line-height:1.21429em;color:#000;background-color:#f7f7f7;padding:.4em}
+div#pager{font-size:14px;line-height:20px;overflow:auto;display:none}div#pager pre{line-height:1.21429em;color:#000;background-color:#f7f7f7;padding:.4em}
 .quickhelp{display:-webkit-box;-webkit-box-orient:horizontal;-webkit-box-align:stretch;display:-moz-box;-moz-box-orient:horizontal;-moz-box-align:stretch;display:box;box-orient:horizontal;box-align:stretch;display:flex;flex-direction:row;align-items:stretch}
 .shortcut_key{display:inline-block;width:20ex;text-align:right;font-family:monospace}
 .shortcut_descr{display:inline-block;-webkit-box-flex:1;-moz-box-flex:1;box-flex:1;flex:1}