With "Open Side By Side" enabled, split panes are continually added

[forivall]

Issue Type: Bug

Steps to Reproduce:

1. Find related -> open file
2. Do it again on the new file, selecting what was the original file
3. Expected: it should focus on the original file, instead, it opens a new split pane to the right.

Also, it takes a reload for changes to the "Open Side By Side" option to take effect, which is more of an annoying quirk.

Extension version: 0.9.0
VS Code version: Code 1.43.0 (78a4c91400152c0f27ba4d363eb56d2835f9903a, 2020-03-09T19:34:44.548Z)
OS version: Darwin x64 18.7.0

System Info

Item	Value
CPUs	Intel(R) Core(TM) i5-3470S CPU @ 2.90GHz (4 x 2900)
GPU Status	2d_canvas: enabled flash_3d: enabled flash_stage3d: enabled flash_stage3d_baseline: enabled gpu_compositing: enabled metal: disabled_off multiple_raster_threads: enabled_on oop_rasterization: disabled_off protected_video_decode: unavailable_off rasterization: enabled skia_renderer: disabled_off_ok video_decode: enabled viz_display_compositor: enabled_on viz_hit_test_surface_layer: disabled_off_ok webgl: enabled webgl2: enabled
Load (avg)	2, 2, 2
Memory (System)	32.00GB (1.17GB free)
Process Argv
Screen Reader	no
VM	0%

Settings

  "findrelated.rulesets": [
    {
      "name": "js",
      "rules": [
        {
          "pattern": "(.+)\/([^\/]+?)\\.([tj]sx?)$",
          "locators": [
            "$1/{test,tests,__tests__,__test__}/$2{.spec,.test,}.$3"
          ]
        },
        {
          "pattern": "src/(.+)\/([^\/]+?)\\.([tj]sx?)$",
          "locators": [
            "src/$1/{test,tests,__tests__,__test__}/$2{.spec,.test,}.$3",
            "{test,tests,__tests__,__test__}/$1/$2{.spec,.test,}.$3",
          ]
        },
        {
          "pattern": "(.+)\/(?:tests?|__tests?__)\/((?:.+?/)?(?:[^\/]+?))(?:\\.spec|\\.test)?\\.([tj]sx?)$",
          "locators": [
            "$1/$2.$3",
            "src/$1/$2.$3"
          ]
        },
        {
          "pattern": "(?:tests?|__tests?__)\/((?:.+?/)?(?:[^\/]+?))(?:\\.spec|\\.test)?\\.([tj]sx?)$",
          "locators": [
            "$1.$2",
            "src/$1.$2"
          ]
        }
      ]
    }
  ],
  "findrelated.applyRulesets": [
    "aspnet",
    "aspnet-mvc",
    "aurelia",
    "c/c++",
    "csharp",
    "minified",
    "xaml",
    "js"
  ],
  "findrelated.openSideBySide": true,

[Gregory108]

And even further: adding "workbench.editor.revealIfOpen": true, does not solve the problem