Normalize cell source \r line endings

[jasongrout]

References

Fixes #10941

Code changes

Normalize \r cell line endings to \n.

User-facing changes

We also change the bug report message in the js console to clearly indicate that if the user pastes data into the issue, it will include the text or code of their editor. This helps prevent users sharing code unwittingly.

Backwards-incompatible changes

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Benchmark report

The execution time (in milliseconds) are grouped by test file, test type and browser.
For each case, the following values are computed: min <- [1st quartile - median - 3rd quartile] -> max.

Results table

Test file	large_code_notebook	large_md_notebook
open
chromium
actual	6200 <- [7955 - 8503 - 8939] -> 9213	3900 <- [4020 - 4261 - 4374] -> 4572
expected	6938 <- [7584 - 7618 - 7760] -> 8204	3461 <- [3524 - 3534 - 3590] -> 4136
switch-from
chromium
actual	442 <- [485 - 498 - 523] -> 565	307 <- [314 - 327 - 354] -> 378
expected	464 <- [480 - 489 - 499] -> 789	310 <- [338 - 344 - 352] -> 370
switch-to
chromium
actual	1747 <- [1815 - 1861 - 1874] -> 1936	1510 <- [1550 - 1572 - 1607] -> 1702
expected	1706 <- [1730 - 1764 - 1814] -> 2015	1541 <- [1549 - 1562 - 1574] -> 1608
close
chromium
actual	6125 <- [14638 - 15877 - 17096] -> 19965	3677 <- [4070 - 4348 - 4510] -> 5055
expected	5176 <- [5770 - 10533 - 14493] -> 18824	3325 <- [3691 - 3890 - 3939] -> 4073

❗ Test metadata have changed

--- /dev/fd/63	2021-10-09 00:34:40.633123968 +0000
+++ /dev/fd/62	2021-10-09 00:34:40.633123968 +0000
@@ -8,33 +8,33 @@
   },
   "systemInformation": {
     "cpu": {
-      "brand": "Xeon® E5-2673 v3",
+      "brand": "Xeon® Platinum 8171M",
       "cache": {
         "l1d": 65536,
         "l1i": 65536,
-        "l2": 524288,
-        "l3": 31457280
+        "l2": 2097152,
+        "l3": 36700160
       },
       "cores": 2,
       "family": "6",
-      "flags": "fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush mmx fxsr sse sse2 ss ht syscall nx pdpe1gb rdtscp lm constant_tsc rep_good nopl xtopology cpuid pni pclmulqdq ssse3 fma cx16 pcid sse4_1 sse4_2 movbe popcnt aes xsave avx f16c rdrand hypervisor lahf_lm abm invpcid_single pti fsgsbase bmi1 avx2 smep bmi2 erms invpcid xsaveopt md_clear",
+      "flags": "fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush mmx fxsr sse sse2 ss ht syscall nx pdpe1gb rdtscp lm constant_tsc rep_good nopl xtopology cpuid pni pclmulqdq ssse3 fma cx16 pcid sse4_1 sse4_2 movbe popcnt aes xsave avx f16c rdrand hypervisor lahf_lm abm 3dnowprefetch invpcid_single pti fsgsbase bmi1 hle avx2 smep bmi2 erms invpcid rtm mpx avx512f avx512dq rdseed adx smap clflushopt avx512cd avx512bw avx512vl xsaveopt xsavec xsaves md_clear",
       "governor": "",
       "manufacturer": "Intel®",
-      "model": "63",
+      "model": "85",
       "physicalCores": 2,
       "processors": 1,
       "revision": "",
       "socket": "",
-      "speed": 2.4,
+      "speed": 2.6,
       "speedMax": null,
       "speedMin": null,
-      "stepping": "2",
+      "stepping": "4",
       "vendor": "GenuineIntel",
       "virtualization": false,
       "voltage": ""
     },
     "mem": {
-      "total": 7291699200
+      "total": 7291695104
     },
     "osInfo": {
       "arch": "x64",
@@ -42,11 +42,11 @@
       "codename": "Focal Fossa",
       "codepage": "UTF-8",
       "distro": "Ubuntu",
-      "kernel": "5.8.0-1042-azure",
+      "kernel": "5.8.0-1040-azure",
       "logofile": "ubuntu",
       "platform": "linux",
       "release": "20.04.3 LTS",
-      "serial": "6c19bc2f6263432da3d31804b6f46a17",
+      "serial": "0f5fd491ff264b5f9d56e03599b4fae0",
       "servicepack": "",
       "uefi": false
     }

[blink1073]

Thank you!

[blink1073]

@meeseeksdev please backport to 3.2.x

[meeseeksmachine]

This pull request has been mentioned on Jupyter Community Forum. There might be relevant details there:

https://discourse.jupyter.org/t/code-editor-out-of-sync-after-using-sublime-text/11217/21