* Make emote tab completion search for substrings
Previously, tab completion only searched for emotes that start
with the current prefix under the cursor. This commit makes tab
completion look for the current prefix as a substring in any position,
not just the start.
Examples:
* In forsen's channel, tabbing on "pls" will cycle through "DonaldPls", "forsenPls",
"GachiPls", "nyanPls" and "SourPls".
* As a forsen subscriber, tabbing on "sen1" will complete to "forsen1".
* As a pajlada subscriber, tabbing on "shrug" will cycle through
"pajaShrugL" and "pajaShrugR". (Unless you are in a channel with
more "shrug" emotes, of course.)
* Add a setting for prefix and substring completion
This commit adds a setting under the "Miscellaneous" section to allow
user to choose whether they want prefix-only or substring emote
completion.
The QCompleter filter mode and `addString` function are now chosen
according to the user's setting.
* Improve description of emote completion setting
Also reintroduce a blank line that went missing.
This commit fixes the unresponsiveness of the "Manage Account" button
(described in #1188).
Apparently, focus was lost when pressing down the mouse button. This is
circumvented by setting the focus policy of the button to `Qt::NoFocus`.
The button then works as expected and opens the "Account" page in the
preferences.
* Move "About" tab in Settings
* Resize Settings window
This prevents from spawning horizontal scroll (which is caused by too long line
in "Attributions" group)
* Fix "show license" link width
If you clicked empty space next to link application assumed you clicked link.
I fixed that by using QLabels instead of SignalLabel (there's something "wrong"
with them, but I couldn't find what)
In the same commit, because I misunderstood the original issue, I also
split out the parsing of the highlights and triggering of the highlight
sounds/alerts into separate functions.
Fixes#1160
I also re-enabled the "sound url changer" that was commented out in an
earlier commit.
Fixes#1170
