[geek1011]

I might also be able to increase the number of history bookmarks stored with a patch.

Update: This seems doable. I'll test this and make a patch later:

Spoiler:

                            _ZN20BookmarkHistoryMixin12pushBookmarkERK8Bookmark:        // BookmarkHistoryMixin::pushBookmark(Bookmark const&)
0087bdb8 B0B5                   push       {r4, r5, r7, lr}
0087bdba 051D                   adds       r5, r0, #0x4
0087bdbc 0446                   mov        r4, r0
0087bdbe 00AF                   add        r7, sp, #0x0
0087bdc0 2846                   mov        r0, r5
0087bdc2 7BF414E8               blx        _ZN7QVectorI8BookmarkE6appendERKS0_@PLT ; QVector<Bookmark>::append(Bookmark const&)
0087bdc6 6368                   ldr        r3, [r4, #0x4]
0087bdc8 5968                   ldr        r1, [r3, #0x4]
0087bdca 0229                   cmp        r1, #0x2
0087bdcc 00DC                   bgt        loc_87bdd0

                            loc_87bdce:
0087bdce B0BD                   pop        {r4, r5, r7, pc}                     ; CODE XREF=_ZN20BookmarkHistoryMixin12pushBookmarkERK8Bookmark+32, _ZN20BookmarkHistoryMixin12pushBookmarkERK8Bookmark+96
                        ; endp

                            loc_87bdd0:
0087bdd0 9A68                   ldr        r2, [r3, #0x8]                       ; CODE XREF=_ZN20BookmarkHistoryMixin12pushBookmarkERK8Bookmark+20
0087bdd2 22F00040               bic        r0, r2, #0x80000000
0087bdd6 0028                   cmp        r0, #0x0
0087bdd8 F9D0                   beq        loc_87bdce

0087bdda 1868                   ldr        r0, [r3]
0087bddc 0128                   cmp        r0, #0x1
0087bdde 06D9                   bls        loc_87bdee

0087bde0 0023                   movs       r3, #0x0
0087bde2 22F00042               bic        r2, r2, #0x80000000
0087bde6 2846                   mov        r0, r5
0087bde8 76F4B0EC               blx        _ZN7QVectorI8BookmarkE11reallocDataEii6QFlagsIN10QArrayData16AllocationOptionEE@PLT ; QVector<Bookmark>::reallocData(int, int, QFlags<QArrayData::AllocationOption>)
0087bdec 6368                   ldr        r3, [r4, #0x4]

                            loc_87bdee:
0087bdee DD68                   ldr        r5, [r3, #0xc]                       ; CODE XREF=_ZN20BookmarkHistoryMixin12pushBookmarkERK8Bookmark+38
0087bdf0 5A59                   ldr        r2, [r3, r5]
0087bdf2 1D44                   add        r5, r3
0087bdf4 2846                   mov        r0, r5
0087bdf6 1368                   ldr        r3, [r2]
0087bdf8 9847                   blx        r3
0087bdfa 6368                   ldr        r3, [r4, #0x4]
0087bdfc 05F17001               add.w      r1, r5, #0x70                        ; argument "__src" for method memmove@PLT
0087be00 2846                   mov        r0, r5                               ; argument "__dest" for method memmove@PLT
0087be02 5B68                   ldr        r3, [r3, #0x4]
0087be04 013B                   subs       r3, #0x1
0087be06 DA01                   lsls       r2, r3, #0x7
0087be08 A2EB0312               sub.w      r2, r2, r3, lsl #4                   ; argument "__n" for method memmove@PLT
0087be0c 71F4EAE8               blx        memmove@PLT                          ; memmove
0087be10 6268                   ldr        r2, [r4, #0x4]
0087be12 5368                   ldr        r3, [r2, #0x4]
0087be14 013B                   subs       r3, #0x1
0087be16 5360                   str        r3, [r2, #0x4]
0087be18 D9E7                   b          loc_87bdce
0087be1a 00BF                   nop

This is where the history limit seems to be done (none of it's callers do any size checks), and it looks like a simple QVector::append followed by an inlined and optimized if (QVector::size() > 2) QVector::removeFirst(), which is actually a QVector::erase(start, start+1) (see https://code.woboq.org/qt5/qtbase/sr...E8iteratorES3_).