Elide tab titles left so key information at the end of the string doesn't get cut off

Summary:
Tab Titles currently elide right. Generally the more useful information is at the right
side of the string--even more so when full paths are being used.

BUG: 406569
FIXED-IN: 19.04.2

Test Plan:
- No change when tab titles don't get elided
- When tabs show the full path and titles are elided, they're now useful: {F6782447}
- When tabs don't show the full path and are elided, they're elided on the other side which seems maybe a tiny bit better, but at least no worse: {F6782448}

Reviewers: #dolphin, #vdg, elvisangelaccio

Reviewed By: #dolphin, elvisangelaccio

Subscribers: ndavis, elvisangelaccio, kneckermcknacksack, filipf, kfm-devel

Tags: #dolphin

Differential Revision: https://phabricator.kde.org/D20689

src/dolphintabwidget.cpp

@@ -19,6 +19,7 @@
 
 #include "dolphintabwidget.h"
 
+#include "dolphin_generalsettings.h"
 #include "dolphintabbar.h"
 #include "dolphintabpage.h"
 #include "dolphinviewcontainer.h"
@@ -114,6 +115,14 @@ void DolphinTabWidget::readProperties(const KConfigGroup& group)
 
 void DolphinTabWidget::refreshViews()
 {
+    // Left-elision is better when showing full paths, since you care most
+    // about the current directory which is on the right
+    if (GeneralSettings::showFullPathInTitlebar()) {
+        setElideMode(Qt::ElideLeft);
+    } else {
+        setElideMode(Qt::ElideRight);
+    }
+
     const int tabCount = count();
     for (int i = 0; i < tabCount; ++i) {
         tabBar()->setTabText(i, tabName(tabPageAt(i)));