Fix the placeholder line height and search field padding in Safari an…

…d Firefox (see #1019)

Description
-----------

Will turn this

<img width="467" alt="" src="https://user-images.githubusercontent.com/1192057/69656384-bd85bd80-1078-11ea-9779-87f48ca0f696.png">

into

<img width="445" alt="" src="https://user-images.githubusercontent.com/1192057/69656396-c2e30800-1078-11ea-8f81-4f365da5f81b.png">

(Why, Safari, why?)

Commits
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b546b1c Fix the placeholder line height and search field padding in Safari and Firefox

core-bundle/src/Resources/contao/themes/flexible/src/basic.css

@@ -256,11 +256,25 @@ fieldset.checkbox_container,fieldset.radio_container {
 .tl_imageSize_0 {
 	margin-left:1%;
 }
+input[type=search]::-webkit-search-decoration {
+	-webkit-appearance:none;
+}
 @-moz-document url-prefix() {
 	.tl_text,.tl_text_2,.tl_text_3,.tl_text_4,.tl_textarea,.tl_text_unit,.tl_text_trbl,.tl_text_interval {
 		padding:5px 6px;
 	}
+	.tl_text::placeholder,.tl_text_2::placeholder,.tl_text_3::placeholder,.tl_text_4::placeholder,.tl_textarea::placeholder,.tl_text_unit::placeholder,.tl_text_trbl::placeholder,.tl_text_interval::placeholder {
+		line-height:18px;
+	}
 }
+@media not all and (min-resolution:.001dpcm) { @supports (-webkit-appearance:none) {
+	.tl_text::placeholder,.tl_text_2::placeholder,.tl_text_3::placeholder,.tl_text_4::placeholder,.tl_textarea::placeholder,.tl_text_unit::placeholder,.tl_text_trbl::placeholder,.tl_text_interval::placeholder {
+		line-height:16px;
+	}
+	input[type=search] {
+		padding:2px 0 4px 6px;
+	}
+}}
 
 /* Select menus */
 select {

core-bundle/src/Resources/contao/themes/flexible/src/main.css

@@ -444,9 +444,6 @@ h2.sub_headline {
 	width:60%;
 	margin-left:1%;
 }
-input[type=search]::-webkit-search-decoration {
-	-webkit-appearance:none;
-}
 
 /* Boxes */
 .tl_xpl {