We have a few CodeMirror instances where we're using the default line height (`line-height: normal`), resulting in a line-height in the 13-14.5px range (depending on the font, OS, resolution). By contrast, the Debugger uses 15px explictly, and that's a style we're trying to generalize.
This patch sets a 15px line-height for:
- Inspector: the CodeMirror instance used in the markup view for "Edit as HTML" and in event tooltips
- Style Editor: the main editor instance
- Console: the jsterm but only in editor mode (since the output uses a 14px line-height on purpose, the jsterm in standard mode keeps this 14px line-height to minimize visual jumps when sending a command)
Differential Revision: https://phabricator.services.mozilla.com/D49593
Emilio Cobos Álvarez