A selection of several parts is moved by ElementPrimitiveDecorator, which
snapped to a fixed 1-unit step at every zoom. That is the "selection is
big" half of #112: below 100 % one part landed on the 10 grid but a
multi-part selection did not, and at 100-400 % it ignored the grid too.
It now snaps to the editor's current grid, as a single part does; Ctrl
still gives the fine 1-unit step. Resizing and arrow-key moves are
unchanged.
Also from review: add rows just below each zoom threshold to
tst_elementviewgrid (each catches a moved threshold the old rows missed),
and use one grid_step in drawBackground() instead of identical x/y copies.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Below 100 % ElementView::drawBackground() hid the grid and also set the
snap step to 1 unit, so anything dragged while zoomed out landed off the
grid with nothing on screen to show it. A large symbol opens fitted to
the window below 100 %, which is why the report also says "when the
selection is big".
Keep hiding the grid below 100 % (its dots would merge into a grey
wash), but snap every 10 units, as at 100 %. The zoom-to-grid rule moves
into a header-only ElementViewGrid so it can be tested without an
editor window, like textgrid.h.
Checked in the editor: a one-rectangle symbol zoomed out to about 0.6x,
its edge dragged by (15, 10) px and saved: master moves it by (28, 18),
this branch by (30, 20). tst_elementviewgrid fails with the old step 1
and passes now; ctest 45/45.
Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
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