Make event browser columns properly resizable and re-orderable

* Annoyingly although Qt has an internal bool allowUserMoveOfSection0
  which does exactly what we want allowing the tree column to be
  movable, we can't enable it because it's private. So instead we have
  to re-implement section moving ourselves.
* Minor tweak - also made RDTreeWidgets non-movable by default since
  usually we don't want to allow it.

qrenderdoc/Windows/EventBrowser.cpp

@@ -31,6 +31,7 @@
 #include "Code/CaptureContext.h"
 #include "Code/QRDUtils.h"
 #include "Code/Resources.h"
+#include "Widgets/Extended/RDHeaderView.h"
 #include "ui_EventBrowser.h"
 
 struct EventItemTag
@@ -73,9 +74,15 @@ EventBrowser::EventBrowser(ICaptureContext &ctx, QWidget *parent)
   ui->events->setColumns(
       {tr("Name"), lit("EID"), lit("Duration - replaced in UpdateDurationColumn")});
 
+  ui->events->setHeader(new RDHeaderView(Qt::Horizontal, this));
+  ui->events->header()->setStretchLastSection(true);
+  ui->events->header()->setDefaultAlignment(Qt::AlignLeft | Qt::AlignVCenter);
+
   ui->events->header()->resizeSection(COL_EID, 80);
 
-  ui->events->header()->setSectionResizeMode(COL_NAME, QHeaderView::Stretch);
+  ui->events->header()->setMinimumSectionSize(40);
+
+  ui->events->header()->setSectionResizeMode(COL_NAME, QHeaderView::Interactive);
   ui->events->header()->setSectionResizeMode(COL_EID, QHeaderView::Interactive);
   ui->events->header()->setSectionResizeMode(COL_DURATION, QHeaderView::Interactive);
 
@@ -83,9 +90,9 @@ EventBrowser::EventBrowser(ICaptureContext &ctx, QWidget *parent)
   // expand/collapse widgets. Then we need to put them back in order
   ui->events->header()->moveSection(COL_NAME, COL_EID);
 
-  // Qt doesn't allow moving the column with the expand/collapse widgets, so this
-  // becomes quickly infuriating to rearrange, just disable until that can be fixed.
-  ui->events->header()->setSectionsMovable(false);
+  ui->events->header()->setSectionsMovable(true);
+
+  ui->events->header()->setCascadingSectionResizes(false);
 
   ui->events->setItemVerticalMargin(3);