ui: improve HTML inline layout and old Reddit rendering

- implement per-side CSS border styles and patterned rendering
  - preserve rectangular rasterization for thin dotted borders
  - separate CSS and native-widget border defaults
  - correct inline atomic-box and vertical-align baseline layout
  - collapse adjacent block margins in rich-text flow
  - preserve forced line breaks and formatting margins
  - size HTML text inputs from font ascent and descent
  - expose replaced-control text baselines to inline layout
  - enforce single-owner painting for inline backgrounds and borders
  - enable and update the old Reddit visual regression golden
  - add generic layout, border, and form-control regression tests
  - document spec-first HTML work and project build conventions

src/tools/eeiv/eeiv.cpp

@@ -408,6 +408,8 @@ void App::registerKeyBindings() {
 					if ( texture )
 						texture->setFilter( mTextureFilter );
 				}
+
+				mImageViewer->invalidateDraw();
 			}
 		} else if ( key == KEY_L ) {
 			mImageViewer->setPreserveImageView( !mImageViewer->getPreserveImageView() );