Merge #7297: fix(qt): make governance search case-insensitive

c318e57 fix(qt): make governance search case-insensitive (PastaClaw)

Pull request description:

  # PR description

  ## Summary

  - Make the Governance proposals title filter case-insensitive.
  - Match the behavior already used by other Qt search/filter views.

  Closes #7287.

  ## Validation

  - `git diff --check`
  - Pre-PR review gate: ship
  - Not run: full build / GUI smoke test; no build directory was available in
    this worktree.

ACKs for top commit:
  PastaPastaPasta:
    utACK c318e57
  knst:
    ACK c318e57

Tree-SHA512: 3cc78a8cd43769ecd61c5fcb8af3c1825a98d86cdf2e74f96e6063444be684c547c5056ee797be8e01059065d18222faab99af3f842e9c2f1e475f40902cf9e0

Author: PastaPastaPasta

src/qt/proposallist.cpp

@@ -81,6 +81,7 @@ ProposalList::ProposalList(QWidget* parent) :
     proposalModelProxy->setSourceModel(proposalModel);
     proposalModelProxy->setSortRole(Qt::EditRole);
     proposalModelProxy->setFilterKeyColumn(ProposalModel::Column::TITLE); // filter by title column...
+    proposalModelProxy->setFilterCaseSensitivity(Qt::CaseInsensitive);
     connect(ui->filterLineEdit, &QLineEdit::textChanged, proposalModelProxy, &QSortFilterProxyModel::setFilterFixedString);
 
     // Changes to number of rows should update proposal count display.