fix(quickview): LSP hover content stretches to the popover width

The QuickView popover centers and shrink-wraps each provider's content
(.quick-view-item is a flex column with align-items:center - right for
image/color previews). When another provider widens the popover - e.g. the
problem row with its Fix button that now accompanies quickfixes - the
narrower hover content floated centered in the leftover space (a small
signature box in the middle of a wide popup). align-self:stretch on
.lsp-hover-quickview makes just the LSP hover fill the available width,
left-aligned, while image previews stay centered as designed.

Author: abose

src/styles/brackets.less

@@ -2221,6 +2221,11 @@ a, img {
 
 .lsp-hover-quickview {
     text-align: left;
+    // The QuickView popover centers + shrink-wraps each provider's content (.quick-view-item is a
+    // flex column with align-items:center - right for image/color previews). When another provider
+    // (e.g. a problem row with its Fix button) makes the popover wider, our content would float
+    // centered in the leftover space - stretch to the available width instead.
+    align-self: stretch;
     max-width: 520px;
     padding: 2px 4px;
     font-size: 12.5px;