#436 Blank lines confuse uncomment toggle

[Jack Tanner]

Given the commented code

#if ($foo) {
# bar;

#}

If you select these 4 lines, and Toggle Comment (Ctrl+/), they get commented again, i.e.,

##if ($foo) {
## bar;
#
##}

instead of getting uncommented, i.e,.

if ($foo) {
bar;

}

The comment lexer should ignore whitespace-only lines.

[Jack Tanner]

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Another bug is that if a comment character has whitespace to its left, the toggle will comment the same line again.