Free G-code result buffers with clear_and_shrink

src/libslic3r/GCode/GCodeProcessor.cpp

@@ -2602,16 +2602,13 @@ void GCodeProcessorResult::reset() {
     //BBS: add mutex for protection of gcode result
     lock();
 
-    // release rather than clear: these two are sized by the print - one entry per move and one
-    // per g-code line - and a reset is where the memory is expected to go back to the allocator
-    // (see BackgroundSlicingProcess::apply()). The capacity would not be reused anyway: the
-    // result is refilled by move-assigning the processor's own result.
-    moves = std::vector<MoveVertex>();
+    // moves and lines_ends grow with the print: free them, as no reset result reuses the capacity.
+    clear_and_shrink(moves);
     plate_mass = {};
     object_masses.clear();
     body_masses.clear();
     support_masses.clear();
-    lines_ends = std::vector<size_t>();
+    clear_and_shrink(lines_ends);
     printable_area = Pointfs();
     //BBS: add bed exclude area
     bed_exclude_area = Pointfs();